3500/42M preamplifier seismic monitoring instrument BENTLY
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Specifications
Part number: 3500/42M
Manufacturer: Bently Nevada
Country of production: United States
Product type: Front end seismic monitoring device
Series: Bently Nevada 3500
3500/42M is a preamplifier seismic monitoring component developed by Bently Nevada. It is a four channel monitor with proximity and seismic sensor inputs. It compares the adjustment signal with user programmable alarms and adjusts the signal to generate vibration and position readings. The 3500 rack configuration software can be used to program each channel to monitor and report radial vibration, thrust position, REBAM, acceleration, expansion difference, eccentricity, velocity, and other parameters.
3500/42M characteristics
The monitoring channels are paired and can perform up to two specified functions simultaneously. For example, channels 1 and 2 can perform one function, while channels 3 and 4 can perform another or the same function.
The Proximitor earthquake monitor protects machinery by comparing monitoring parameters in real-time with selected alarm setpoints and triggering alarms. It reports critical machine information to operation and maintenance staff.
According to the arrangement, each channel typically adjusts its input signal to generate a set of static values. Alarm setpoints can be established for any current static value, and danger setpoints can be set for any two of them.
Use rack configuration software to set alarm levels for any value measured by the monitor, and set danger setpoints for any two values measured by the monitor. For each measurement value, the alarm can be set to 0 to 100% of full scale. When the full-scale range exceeds the range of the sensor, the set point is limited by the sensor range.
3500/42M Technical Features
input
Accept signals from one to four proximity, acceleration, or velocity sensors.
Power consumption is 7.7 watts.
output
When the monitoring module is working normally, the OK LED light is on.
When the earthquake monitoring module is connected to other modules in the 3500 rack, the TX/RX LED lights up.
If the earthquake monitor is in bypass mode, the bypass LED indicator will light up.
Buffer sensor: Each channel has its own coaxial connector on the front of the display. Each connector is equipped with built-in short-circuit protection.
550 ohm output impedance
Axis power supply -24 Vdc
Resolution 0.3662A per bit
Sensor power supply -24 Vdc
Absolute output impedance of 300 ohms
signal processing
Temperature: 25 degrees Celsius
Radial vibration
User programmable direct filter
Unipolar, -3db at 4 Hz to 4000 Hz or 1 Hz to 600 Hz, 1% accuracy
Gap filter: 0.09 Hz, -3 dB
Non 1X filter: Constant Q notch filter, minimum stopband suppression of -34.9 dB, 60 cpm to 15.8 times operating speed
Smax varies between 0.125 and 15.8 times the operating speed.
1X and 2X vector filters: constant Q filters with a minimum suppression of -57.7 dB in the stopband
accuracy
Gap and Direct: Filtering not included within 0.33% of full scale
1X and 2X: within 0.33% of the normal maximum value of 1% at full scale
Expansion difference and thrust
Within 0.33% of full-scale accuracy
3500/42M alarm
Use rack configuration software to set alarm thresholds for any value measured by the monitor, and set danger setpoints for any two of these values.
Alarm Set Point
For each measurement value, the alarm can be set to 0% to 100% of full scale. When the full-scale range is greater than the set value, the set value will be limited by the sensor range.
Accuracy of alarm set points
0.13% of the required value exists.
3500/42M static value
The measured values used to check the machine are called static values. The 3500/42M preamplifier seismic monitoring instrument returns the following static values:
Radial vibration
Direct, gap, 1X amplitude, 1X
Phase lag, 2X amplitude, 2X
Phase lag, not 1X amplitude and Smax amplitude
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